[Numpy-discussion] bug in numpy.histogram?

John Hunter jdh2358@gmail....
Wed Feb 20 15:49:37 CST 2008


We recently deprecated matplotlib.mlab.hist, and I am now hitting a
bug in numpy's historgram, which appears to be caused by the use of
"any" that does not exist in the namespace.  Small patch attached.
The example below exposes the bug:

Python 2.4.2 (#1, Feb 23 2006, 12:48:31)
Type "copyright", "credits" or "license" for more information.

IPython 0.8.3.svn.r2876 -- An enhanced Interactive Python.
?         -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help      -> Python's own help system.
object?   -> Details about 'object'. ?object also works, ?? prints more.

In [1]: import numpy as np

In [2]: np.__file__
Out[2]: '/home/titan/johnh/dev/lib/python2.4/site-packages/numpy/__init__.pyc'

In [3]: np.__version__
Out[3]: '1.0.5.dev4814'

In [4]: x = np.random.randn(100)

In [5]: bins = np.linspace(x.min(), x.max(), 40)

In [6]: y = np.histogram(x, bins=bins)
------------------------------------------------------------
Traceback (most recent call last):
  File "<ipython console>", line 1, in ?
  File "/home/titan/johnh/dev/lib/python2.4/site-packages/numpy/lib/function_base.py",
line 155, in histogram
    if(any(bins[1:]-bins[:-1] < 0)):
NameError: global name 'any' is not defined
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